3 pairs
To find the mean, add up all the number of pairs of shoes owned by the 6th graders and divide by the total number of 6th graders surveyed:
(5 + 6 + 1 + 1 + 4 + 7 + 2 + 1) / 8 = 27 / 8 = 3.375
Rounded to the nearest whole number, the mean number of pairs of shoes owned by the 6th graders surveyed is 3 pairs.